Embryology Flashcards
What germ layer gives rise to the kidney
Intermediate mesoderm
What do the pronephros become in adults life
Nothing - remnants in adult life
What is the ultimate function of the mesonephric duct
It connects where the bladder is going to develop
What happens to the segments of the mesonephros during development
As development goes on, the more cranial parts begin to regress and degenerate and disappear
The mesnephros connect with two areas of the embryo. What are these
Vasculature
Developing bladder
How many mesonephric tubes are produced
40
When do the mesonephric tubules regress. How many left and where are they situated
End of Week 5 leaving 20 at L1-L3
What do the mesonephros differentiate into and when.
Excretory units
Between weeks 6-10
What do the mesonephros act as during weeks 6-10
Kidneys - producing a filtrate but waste is removed via the placenta
When do the metaphors appear
Week 5
What do the metaphors become
The permanent kidney
What do the metaphors form from
Ureteric Bud and Metanephric Blastema
What is the ureteric bud
The communication to allow urine to pass to the bladder from the kidney
Where do the ureteric buds sprout form and when
distal mesonephric ducts
Day 28
What do the ureteric buds penetrate and when
portion of aural intermediate mesoderm
Day 32
What happens if there is no contact between the ureteric bud and the metanephric meenchyme
You can’t form a kidney
What happens if there is a failure of the ureteric bud to meet the metanephric mesenchyme bilaterally
Not compatible with life as there is no mechanism for filtering the blood
What does the ureteric bud go on to form
the collecting system
What forms the nephron
metanephric Blastema
What shape does the nephrite vesicle take on
S shape
When do the kidneys attain their adult position
About week 9
What happens to the blood vessels that supplied the kidneys before they ascended
They degenerate as they are no longer needed. These are more caudal
What happens if the kidneys move up but the caudal arteries do not degenerate
We end up with accessory renal arteries
What does the Cloaca divide into
A posterior structure (Rectum) and an anterior structure (Primitive urogenital sinus)
